Wave 3D Is A 30-Day Urinal Screen That Contains Three To Five Times More Fragrance Than Other Urinal Screens. Patented, Two-Sided Design Eliminates 97 Percent Of Urine Splash On Both Sides For Error-Free Installation. Crafted For Convenience, Simply Place The Wave 3D Over The Drain In The Urinal, And You'Re Done. Each Screen Has A Date Tab For Replacement Reminders. It Contains Beneficial Bacteria That Consume Odors And Keep Drains Clean, Clear And Smelling Fresh With A Spiced Apple Fragrance.